I just finished up my own version of Kavu's Chillba. I plan to try to write a guide for it over the next couple of days to put up on my blog. For now, I am too excited to not share it and so I have put up some pictures on there and will post the guide as soon as it is done.

Same design as links given earlier. It will always be a challenge in wind and could become unusable in high winds. You will need to be sitting in shade to use it as a sit pad. Just pointing out the obvious.